Friction-gear for railway-cars.



G. A. JOHNSON.

Fmcrlow GEAR FOR RAILWAY GARS.

APPLiCATION FlLED DEC. 2G. |916,

r mx wlllullnllllli titi , radiante onirica.,

enen-sn Jonnson, or cinrioaooiminors Assrenon To WILLIAM H. Minna, or

CHAZY, :NEW YORK.

retorica-enen ron RAILWAY-cans.

Specification of Letters Patent. Ptit-@intend Apr., 29, lllilitl).

.application filed December 26, 1916t Serial No. 138,795.

reference being had to the accompanyingL drawings. forming a part of this specification.

This invention relates to improvements in friction gears for railway cars.

The object of the invention is to provide a friction xp jear consisting of few parts capable of being relatively cheaply manufactured and so arranged as to provide high capacity and having' a certain release. l

in the drawing forming a part of this specificatioa. Figure 1 is a part elevation, parl longitudinal section of a draft rigging showing iiiy improvements in connection therewith. Fig. 2 is a transverse, vertical sectional view taken substantially `on the lintl 2 2 et Fig. 1. Fig. 3 is a detail perspective of one of the sets of friction shoes. Fig. is a detail perspective of the other setof friction shoes employed in the inven tion. lig. o is a sectional view similar to Fig. 1. illustrating a different embodiineiit of the invention. And lfig. 6 is an vend elevation of the form of gear illustrated in Fig.

ln said drawing, referring to the type ofg'ear illustrated in Figs. 1, 2, 3 and 4, lll-10 denote center or draft sills to which are secured rear stops 11 and front stops 12. Cooperating with said stops are rear follower 18 and front follower 1i. The draw oar 15 is operatively connected to the friction gear, hereinafter described, by a yoke 16 and all the parts are held in suit-- alilc position bymeans of a saddle plate 17.

The improved friction gear proper, as

" shown, comprises al: preferably cylindrical cast-iiignfhaving integral friction shell 18 proper, spring'case 19 and rear wall 20. EX teinlingr forwardly from the wall, 20 from thel center of the latter and formed integrally therewith is av friction post 21 tapered at itsforward end as indicated at fis shown in Fig. 2, the post 21 is rectangiilar in cross section and adapted to cooperate therewith is a series of fric-tion shoes 23-23, four in number and each having a longitudinal surface along its inner face.

to engage the corresponding tapered or inclined face of the end 22 off the post. Each t the shoes 23 is provided on its exterior, at its inner end with a conical wedging face 26. Surrounding the series of friction shoes 23 is another series of friction slices 2727. l Each yof the latter is provided on its interior with a conical wedge face 28 engaging the corresponding wedge face 26 and on its exterior, each shoe 27 is provided with acylindiical friction surface 29 which engages the interior cylindrical friction surface of the shell 18.. As clearly appears froni Fig. l, pressure is transferred from the `follower 14 to the series of friction shoes 23 in lines parallel tothe axis of the gearand the other series of friction shoes 27 is located at the inner end of the series of shoes 23. rThe series of shoes 27 is resisted in itslongi- .tudinal movements by the spring of the gear which, as shown, comprises an outer coil 30 and an inner, lighter coil 31.

In operation, upon inward movement of the draw bar, the pressure is applied to the shoes 23 and as the latter move longitudinally and inwardly of the castingr A, said shoes are forced outwardly or radially due to travelin f along the tapered portion 22 of the pos As the shoes 23 thus travel, the outer series of friction shoes 27 not only are forced longitudinally within the friction shell, lout are compelled to travel at a faster rate than the friction shoes 23, due to the radial movement of the latter while traveling along the tapered portion 22 of the post. Upon removal of the pressure from the shoes 23, it is apparent that the gear will readily release diie to the taper on the post 21 since any outward movement of the shoes 23 will disengage the latter from tight frictional engagement with the tapered portion 22 of the post. From the precedinnY description, it Will be seen that I am enabled to obtain a gea-r of high capacity since l can employa relatively acute angle between the shoes 23 and the tapered portion of the post and at the same time secure a ready and 'certain release.

ln the construction illustrated in Figs. 5 and (l, the casting A ismade similar to the casting Aexcept that the center post 121 thereof is provided at its forward end iii) with a tapered enlargement 122 having a ,shown in shoes 123 aremade with thelr interior faces of the gear than the angle of the faces of the tapered portion 22 with the axis of the gear thev other figures,A The friction 125 to correspond with the blunter angle on the head 122. Coperating with the friction shoes. 123 is the outer series of friction shoes 127 which also engage th terior cylindrical friction surface of thev shell. A spring consisting of two coils and 31 is confined within thev spring case to resist movementsof the friction elements. The operation will be understood from the preceding description given in connection with the other form of device.

Although I have herein shown and described what embodiment of the invention, the same 1s merely illustrative and I contemplate all changes and modifications that come within the scope of the claims appended hereto.

I claim:

1. In a friction gear, the combination with a friction shell, of a friction postmounted within the shell, the distance he- `extending axially I nowconsider the preferredVV tween the surfaces of the friction post and friction shell gradually decreasing from the. post toward thev tapered outer end, a plurality said tapered shoes longitudinally slidable on end of the post and having exterior wedge y faces, a plurality of friction shoes engaging the friction shell and having coperating wedge faces, and spring means resisting movement of the shoes.

In witness that I claim the foregoing I have hereunto subscribed my name this 22d day of Dec. 1916.

GEORGE A. JOHNSON. 

